bugGNU Octave - Bugs: bug #55424, [octave forge] (communications)...


bug #55424: [octave forge] (communications) rsdec() returns incorrect result if shortened message is used

Submitted by:  Klaus Braun <kmb721>
Submitted on:  Tue 08 Jan 2019 09:07:02 PM UTC  
Category:  Octave Forge Package Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Incorrect Result
Status:  None Assigned to:  None
Originator Name:  Klaus Braun Open/Closed:  Open
Release:  4.4.1 Operating System:  Microsoft Windows

Add a New Comment(Rich Markup)

You are not logged in

Please log in, so followups can be emailed to you.


Fri 11 Jan 2019 07:35:32 PM UTC, comment #1:

Sorry, I missunderstood the selection "Operating System".
This issue impacts surely Any Operating System.
Perhaps this increases the chance of attention.

Klaus Braun <kmb721>
Tue 08 Jan 2019 09:07:02 PM UTC, original submission:

communications *| 1.2.1 |
rsdec() returns errors (in longer messages uncorrectable errors), when I use shortened messages, i.e. the message is shorter than k.
In the following example (encode - decode) there should be of course no error:

The same example but with full lenght message returns no error:

vague guess where the bug could hide:
in gf.cc (ca. line 1741 - 1773)
// Find a corresponding fcr and prim that coincide with the roots.
/* Find prim-th root of 1, used in decoding */
maybe "n" should be replaced by "nn"? (in several places).

Another problem (maybe a following error):
If I use rsgenpoly(?,?,?,0) with zero as b-parameter, then octave crashes when executing rsdec():
Octave crashes (disappears) or if I use poly also for rsenc, then rsdec() executes very long/endless.
I am not really sure if b=0 is a useful input, but nevertheless octave should never crash.

Klaus Braun <kmb721>


(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attach Files:

No files currently attached


Depends on the following items: None found

Items that depend on this one: None found


Carbon-Copy List
  • -email is unavailable- added by kmb721 (Submitted the item)

    Do you think this task is very important?
    If so, you can add your encouragement to it.
    This task has 0 encouragements so far.

    Only project members can vote.




    Follows 1 latest change.

    Date Changed by Updated Field Previous Value => Replaced by
    2019-01-08 mtmiller Summary[octave forge](communications) rsdec() returns incorrect result if shortened message is used => [octave forge] (communications) rsdec() returns incorrect result if shortened message is used

    Back to the top

    Powered by Savane 3.4